A 12x12 inch paver is one square foot. So you would need 240 square feet.
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In theory the answer is 240 tiles but this assumes that the area is "well behaved" and, if not, that you are prepared to use all the offcuts to fill bits in mosaic-style. A shape which in 17 inches wide, for example, will require a lot more pavers.
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80 if the tiles are 12x12 - 12x12 is one square foot covering 80 you would need 80 tiles
144 square feet.